Package pygeodesy :: Module azimuthal :: Class Gnomonic |
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# Class Gnomonic

      object --+
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    named._Named --+
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    named._NamedBase --+
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          _AzimuthalBase --+
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                          Gnomonic

Azimuthal gnomonic projection for the sphere**, see Snyder, pp 164-168 and MathWorld-Wolfram.

Instance Methods
__init__(self, lat0, lon0, datum=None, name=`'````'`) New azimuthal projection. |
forward(self, lat, lon, name=`'````'`) Convert a geodetic location to azimuthal equidistant east- and northing. |
reverse(self, x, y, name=`'````'`, LatLon=None, **LatLon_kwds) Convert an azimuthal equidistant location to geodetic lat- and longitude. |
Inherited from `_AzimuthalBase`: `reset`, `toRepr`, `toStr` Inherited from `named._NamedBase`: `__repr__`, `__str__`, `others` Inherited from `named._Named`: `_dot_`, `attrs`, `classof`, `copy`, `toStr2` Inherited from `object`: `__delattr__`, `__format__`, `__getattribute__`, `__hash__`, `__new__`, `__reduce__`, `__reduce_ex__`, `__setattr__`, `__sizeof__`, `__subclasshook__`

Properties
Inherited from `_AzimuthalBase`: `datum`, `equatoradius`, `flattening`, `iteration`, `lat0`, `latlon0`, `lon0`, `majoradius`, `radius` Inherited from `named._Named`: `classname`, `classnaming`, `name`, `named`, `named2` Inherited from `object`: `__class__`

Method Details

### __init__ (self, lat0, lon0, datum=None, name=`'````'`) (Constructor) |
New azimuthal projection. Arguments: `lat0` - Latitude of the center point (`degrees90`). `lon0` - Longitude of the center point (`degrees180`). `datum` - Optional datum (`Datum`) or the radius of the spherical earth (`meter`). `name` - Optional name for the projection (`str`). Raises: `RangeError` - Invalid `lat0` or `lon0`. `UnitError` - Invalid `lat0`, `lon0` or `datum`. Overrides: object.__init__

### forward (self, lat, lon, name=`'````'`) |
Convert a geodetic location to azimuthal equidistant east- and northing. Arguments: `lat` - Latitude of the location (`degrees90`). `lon` - Longitude of the location (`degrees180`). `name` - Optional name for the location (`str`). Returns: An Azimuthal7Tuple`(x, y, lat, lon, azimuth, scale, datum)` with `x` and `y` in `meter` and `lat` and `lon` in `degrees` and `azimuth` clockwise from true North. The `scale` of the projection is `1` in radial direction and is `1 / reciprocal` in the direction perpendicular to this.

### reverse (self, x, y, name=`'````'`, LatLon=None, **LatLon_kwds) |
Convert an azimuthal equidistant location to geodetic lat- and longitude. Arguments: `x` - Easting of the location (`meter`). `y` - Northing of the location (`meter`). `name` - Optional name for the location (`str`). `LatLon` - Class to use (`LatLon`) or `None`. `LatLon_kwds` - Optional, additional `LatLon` keyword arguments, ignored if `LatLon=None`. Returns: The geodetic (`LatLon`) or if `LatLon` is `None` an Azimuthal7Tuple`(x, y, lat, lon, azimuth, scale, datum)`. Note: The `lat` will be in the range `[-90..90] degrees` and `lon` in the range `[-180..180] degrees`. The `scale` of the projection is `1` in radial direction, `azimuth` clockwise from true North and `1 / reciprocal` in the direction perpendicular to this.